The Industrial Silos come in a pack that includes a set of individual pre-colored pieces.

Some of the pieces come in a PVC sheet and you will need to cut the connections that fix them to the PVC sheet. Assemble the different parts by following the assembly instructions that can be found on this link: http://plastcraftgames.com/en/content/6-assembly-instructions using cyanoacrylate glue or a similar one.